Formula

Example: A level 4 weapon have a 0.05 * 4 = 20% variance. This means a level 4 weapon can do 20% less or 20% more than its base damage value. For a weapon with 100 base damage, this translate to 20% * 100 = 20 damage variance. So for each hit, the player will actually deal a random damage between 80 and 120. Power Maximize will set the damage variance to the highest, so each hit will deal 120 damage.